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Three-phase alternating current-alternating current (AC-AC) direct frequency converter topology structure and control method thereof

A frequency converter and topology technology, which is applied in the direction of converting AC power input into AC power output, output power conversion devices, electrical components, etc., can solve the complex control strategy of matrix converters, reduce system reliability, and increase control difficulty. and other problems, to achieve the effect of simple topology, simple control strategy, and flexible dynamic response.

Inactive Publication Date: 2012-09-12
HARBIN ENG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the control strategy of the matrix converter is complex and the calculation work is heavy; in order to achieve safe commutation, a four-step commutation method is usually used, which increases the difficulty of control and reduces the reliability of the system. The number of switches is large and the system cost is high.

Method used

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  • Three-phase alternating current-alternating current (AC-AC) direct frequency converter topology structure and control method thereof
  • Three-phase alternating current-alternating current (AC-AC) direct frequency converter topology structure and control method thereof
  • Three-phase alternating current-alternating current (AC-AC) direct frequency converter topology structure and control method thereof

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, the present invention is described in more detail:

[0019] combine figure 1 . u A , U C and U Bare the phase voltages of the three-phase AC power supply respectively, the first filter inductor L1, the second filter inductor L2, the third filter inductor L3, the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3 are filters, The first fully controlled device V1, the second fully controlled device V2, the third fully controlled device V3, the fourth fully controlled device V4, the fifth fully controlled device V5, the sixth fully controlled device V6, the seventh fully controlled device Full control device V7, eighth full control device V8, ninth full control device V9, tenth full control device V10, eleventh full control device V11, twelfth full control device V12, tenth full control device The third full-control device V13, the fourteenth full-control device V14, and the fift...

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Abstract

The invention provides a three-phase alternating current-alternating current (AC-AC) direct frequency converter and a control method thereof. The three-phase AC-AC direct frequency converter comprises a three-phase power supply, a filter, a main circuit and a buffer circuit, and is characterized in that the power supply is sequentially connected with the filter and the main circuit, and the main circuit is connected with the buffer circuit. The control method for the three-phase AC-AC direct frequency converter comprises a sinusoidal pulse width modulation (SPWM) control mode and a hysteresis current control mode. The converter is simple in topology structure; and the control method is simple, practical and high in reliability, and comprises a few power conversion stages.

Description

technical field [0001] The invention relates to an electric energy conversion method, in particular to a new topology structure and control method of a three-phase AC-AC direct frequency converter. Background technique [0002] In the conversion and utilization of electric energy, the AC-AC converter plays an important role. It can realize the direct conversion of electric energy without intermediate links, thereby improving efficiency. It is generally divided into two aspects: voltage conversion and frequency conversion and direct voltage conversion and frequency conversion. In terms of variable voltage and constant frequency, relatively mature technologies include thyristor voltage regulating controllers, PWM-controlled AC-AC converters, etc. In terms of realizing AC-AC direct frequency conversion, the relatively early technology is the thyristor-based cycloconverter technology, which has been developed very maturely. The disadvantages are the large number of devices used,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/297
Inventor 赵凯岐白成彪张强
Owner HARBIN ENG UNIV
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